#pragma once
#include "../common/net.hpp"
#include "../common/message.hpp"
#include <functional>
#include <future>
#include <memory>
#include <mutex>
#include <unordered_map>


namespace rpc
{
    namespace client
    {
        class Requestor
        {
        public:
            using ptr = std::shared_ptr<Requestor>;
            using RequestCallback = std::function<void(const BaseMessage::ptr&)>;
            using AsyncResponse = std::future<BaseMessage::ptr>;
            struct RequestDescribe
            {
                using ptr = std::shared_ptr<RequestDescribe>;
                BaseMessage::ptr request;
                RType rtype;
                std::promise<BaseMessage::ptr> response;
                RequestCallback callback;

                // void setRequest(const BaseMessage::ptr &req) { request = req; }
                // void setRType(RType rt) { rtype = rt; }
                // void setRequestCallBack(const RequestCallback &cb) { callback = cb; }
                // AsyncResponse asyncResponse() { return response.get_future(); }
            };

            //接受响应
            void onResponse(const BaseConnection::ptr &conn, BaseMessage::ptr &msg)
            {
                std::string rid = msg->rid();
                RequestDescribe::ptr rdp = getDescribe(rid);
                if(rdp.get() == nullptr)
                {
                    ELOG("收到响应 - %s, 但未找到对应的请求描述！", rid.c_str());
                    return;
                }
                if(rdp->rtype == RType::REQ_ASYNC)
                {
                    rdp->response.set_value(msg);
                }
                else if(rdp->rtype == RType::REQ_CALLBACK)
                {
                    if(rdp->callback)  
                        rdp->callback(msg);
                }
                else 
                {
                    ELOG("请求类型未知");
                }
                delDescribe(rid);
            }
            bool send(const BaseConnection::ptr &conn, const BaseMessage::ptr &req, AsyncResponse &async_rsp)
            {
                RequestDescribe::ptr rdp = newDescribe(req, RType::REQ_ASYNC);
                if(rdp.get() == nullptr)
                {
                    ELOG("构造请求描述对象失败");
                    return false;
                }
                conn->send(req);
                async_rsp = rdp->response.get_future();
                return true;
            }
            bool send(const BaseConnection::ptr &conn, const BaseMessage::ptr &req, BaseMessage::ptr &rsp)
            {
               AsyncResponse rsp_future;
               bool ret = send(conn, req, rsp_future);
                if(ret == false)
                {
                    return false;
                }
                rsp = rsp_future.get();
                return true;
            }

            bool send(const BaseConnection::ptr &conn, const BaseMessage::ptr &req, RequestCallback &cb)
            {
                RequestDescribe::ptr rdp = newDescribe(req, RType::REQ_CALLBACK, cb);
                if(rdp.get() == nullptr)
                {
                    ELOG("构造请求描述对象失败");
                    return false;
                }
                conn->send(req);
                return true;
            }
        private:
            RequestDescribe::ptr newDescribe(const BaseMessage::ptr &req, RType rtype, const RequestCallback &cb = RequestCallback())
            {
                std::unique_lock<std::mutex> lock(_mutex);
                RequestDescribe::ptr rd = std::make_shared<RequestDescribe>();
                rd->request = req;
                rd->rtype = rtype;
                if(rtype == RType::REQ_CALLBACK && cb)
                {
                    rd->callback = cb;
                }
                _request_desc.insert({req->rid(), rd});
                return rd;
            }
            RequestDescribe::ptr getDescribe(const std::string &rid)
            {
                std::unique_lock<std::mutex> lock(_mutex);
                auto it = _request_desc.find(rid);
                if(it == _request_desc.end())
                {
                    return RequestDescribe::ptr();
                }
                return it->second;
            }
            void delDescribe(const std::string &rid)
            {
                std::unique_lock<std::mutex> lock(_mutex);
                _request_desc.erase(rid);
            }
        private:
            std::mutex _mutex;
            std::unordered_map<std::string, RequestDescribe::ptr> _request_desc;
        };
    }
}